VL.GameAudioPlayer

The underlying library SFML doesn’t really support proper multitrack AFAIK. I don’t think they will add it. They aim to provide a basic sound player that works cross platform (as one part of a large game engine package) rather than a high end multitrack DAW engine.

VL.Audio offers much better functionality in terms of routing tracks, mixing, ASIO as well as adding live inputs etc.

What you can do is trigger multiple mono (or stereo) tracks to play at the same time and it may sound ok for a limited time. Would have to test on your hardware and CPU workload to see how it goes.
But it’s not proper multitrack playback and it can go out of sync.